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8mm uniform defect in the right frontal bone at the extreme vertex, which traverses both the outer and inner table of the skull.

Case Discussion

Remarkably the patient was telling the truth. He really did, without any analgesia, use a household electric power drill to drill through his skull (perhaps a DIY borehole?). He is believed to have a psychiatric illness.

The appearances suggest he used the 8mm drill-bit of the set. This has caused a subdural haematoma/collection with the introduction of a significant volume of air. The patient was transferred to a neurosurgical centre for further management.